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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets |  |
Allowance for loan losses | $ 14,097,000 | $ 13,966,000
Loans | 18,655,000 | 15,062,000
Deferred compensation | 10,001,000 | 7,093,000
Net unrealized losses on securities | 6,180,000 | 3,659,000
Impairment of assets | 1,280,000 | 1,748,000
Net operating loss carryforwards | 19,065,000 | 2,419,000
Other | 3,610,000 | 4,722,000
Gross deferred tax assets | 72,888,000 | 48,669,000
Valuation allowance on state net operating loss carryforwards | 0 | 0
Total deferred tax assets | 72,888,000 | 48,669,000
Deferred tax liabilities |  |
Investment in partnerships | 1,572,000 | 757,000
Depreciation | 3,865,000 | 3,163,000
Mortgage servicing rights | 12,350,000 | 10,139,000
Subordinated debt | 1,607,000 | 2,394,000
Other | 1,792,000 | 1,859,000
Total deferred tax liabilities | 21,186,000 | 18,312,000
Net deferred tax assets | $ 51,702,000 | $ 30,357,000

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